/*
 * UAE - The Un*x Amiga Emulator
 *
 * MC68000 emulation generator
 *
 * This is a fairly stupid program that generates a lot of case labels that
 * can be #included in a switch statement.
 * As an alternative, it can generate functions that handle specific
 * MC68000 instructions, plus a prototype header file and a function pointer
 * array to look up the function for an opcode.
 * Error checking is bad, an illegal table68k file will cause the program to
 * call abort().
 * The generated code is sometimes sub-optimal, an optimizing compiler should
 * take care of this.
 *
 * The source for the insn timings is Markt & Technik's Amiga Magazin 8/1992.
 *
 * Copyright 1995, 1996, 1997, 1998, 1999, 2000 Bernd Schmidt
 */

#include "sysconfig.h"
#include "sysdeps.h"
#include <ctype.h>

#include "readcpu.h"

#define BOOL_TYPE "int"

static FILE* headerfile;
static FILE* stblfile;

static int using_prefetch;
static int using_exception_3;
static int cpu_level;

/* For the current opcode, the next lower level that will have different code.
 * Initialized to -1 for each opcode. If it remains unchanged, indicates we
 * are done with that opcode.  */
static int next_cpu_level;

static int* opcode_map;
static int* opcode_next_clev;
static int* opcode_last_postfix;
static unsigned long* counts;

static void read_counts(void)
{
    FILE* file;
    unsigned long opcode, count, total;
    char name[20];
    int nr = 0;
    memset(counts, 0, 65536 * sizeof *counts);

    file = fopen("frequent.68k", "r");
    if (file)
    {
        fscanf(file, "Total: %lu\n", &total);
        while (fscanf(file, "%lx: %lu %s\n", &opcode, &count, name) == 3)
        {
            opcode_next_clev[nr] = 5;
            opcode_last_postfix[nr] = -1;
            opcode_map[nr++] = opcode;
            counts[opcode] = count;
        }
        fclose(file);
    }
    if (nr == nr_cpuop_funcs)
        return;
    for (opcode = 0; opcode < 0x10000; opcode++)
    {
        if (table68k[opcode].handler == -1 && table68k[opcode].mnemo != i_ILLG
            && counts[opcode] == 0)
        {
            opcode_next_clev[nr] = 5;
            opcode_last_postfix[nr] = -1;
            opcode_map[nr++] = opcode;
            counts[opcode] = count;
        }
    }
    if (nr != nr_cpuop_funcs)
        abort();
}

static char endlabelstr[80];
static int endlabelno = 0;
static int need_endlabel;

static int n_braces = 0;
static int m68k_pc_offset = 0;

static void start_brace(void)
{
    n_braces++;
    printf("{");
}

static void close_brace(void)
{
    assert(n_braces > 0);
    n_braces--;
    printf("}");
}

static void finish_braces(void)
{
    while (n_braces > 0)
        close_brace();
}

static void pop_braces(int to)
{
    while (n_braces > to)
        close_brace();
}

static int bit_size(int size)
{
    switch (size)
    {
        case sz_byte: return 8;
        case sz_word: return 16;
        case sz_long: return 32;
        default: abort();
    }
    return 0;
}

static const char * bit_mask(int size)
{
    switch (size)
    {
        case sz_byte: return "0xff";
        case sz_word: return "0xffff";
        case sz_long: return "0xffffffff";
        default: abort();
    }
    return 0;
}

static const char * gen_nextilong(void)
{
    static char buffer[80];
    int r = m68k_pc_offset;
    m68k_pc_offset += 4;

    sprintf(buffer, "xget_ilong (%d)", r);
    return buffer;
}

static const char * gen_nextiword(void)
{
    static char buffer[80];
    int r = m68k_pc_offset;
    m68k_pc_offset += 2;

    sprintf(buffer, "xget_iword (%d)", r);
    return buffer;
}

static const char * gen_nextibyte(void)
{
    static char buffer[80];
    int r = m68k_pc_offset;
    m68k_pc_offset += 2;

    sprintf(buffer, "xget_ibyte (%d)", r);
    return buffer;
}

static void sync_m68k_pc(void)
{
    if (m68k_pc_offset == 0)
        return;
    printf("xm68k_incpc(%d);\n", m68k_pc_offset);
    m68k_pc_offset = 0;
}

/* getv == 1: fetch data; getv != 0: check for odd address. If movem != 0,
 * the calling routine handles Apdi and Aipi modes.
 * gb-- movem == 2 means the same thing but for a MOVE16 instruction */
static void genamode(amodes mode, char* reg, wordsizes size, char* name, int getv, int movem)
{
    start_brace();
    switch (mode)
    {
        case Dreg:
            if (movem)
                abort();
            if (getv == 1)
                switch (size)
                {
                    case sz_byte:
                        #if defined (AMIGA) && !defined (WARPUP)
                        /* sam: I don't know why gcc.2.7.2.1 produces a code worse */
                        /* if it is not done like that: */
                        printf("\tuae_s8 %s = ((uae_u8*)&m68k_dreg (regs, %s))[3];\n", name, reg);
                        #else
                        printf("\tuae_s8 %s = xm68k_dreg (%s);\n", name, reg);
                        #endif
                        break;
                    case sz_word:
                        #if defined (AMIGA) && !defined (WARPUP)
                        printf("\tuae_s16 %s = ((uae_s16*)&m68k_dreg (regs, %s))[1];\n", name, reg);
                        #else
                        printf("\tuae_s16 %s = xm68k_dreg (%s);\n", name, reg);
                        #endif
                        break;
                    case sz_long:
                        printf("\tuae_s32 %s = xm68k_dreg (%s);\n", name, reg);
                        break;
                    default:
                        abort();
                }
            return;
        case Areg:
            if (movem)
                abort();
            if (getv == 1)
                switch (size)
                {
                    case sz_word:
                        printf("\tuae_s16 %s = xm68k_areg (%s);\n", name, reg);
                        break;
                    case sz_long:
                        printf("\tuae_s32 %s = xm68k_areg (%s);\n", name, reg);
                        break;
                    default:
                        abort();
                }
            return;
        case Aind:
            printf("\tuaecptr %sa = xm68k_areg (%s);\n", name, reg);
            break;
        case Aipi:
            printf("\tuaecptr %sa = xm68k_areg (%s);\n", name, reg);
            break;
        case Apdi:
            switch (size)
            {
                case sz_byte:
                    if (movem)
                        printf("\tuaecptr %sa = xm68k_areg (%s);\n", name, reg);
                    else
                        printf("\tuaecptr %sa = xm68k_areg (%s) - xareg_byteinc[%s];\n", name, reg, reg);
                    break;
                case sz_word:
                    printf("\tuaecptr %sa = xm68k_areg (%s) - %d;\n", name, reg, movem ? 0 : 2);
                    break;
                case sz_long:
                    printf("\tuaecptr %sa = xm68k_areg (%s) - %d;\n", name, reg, movem ? 0 : 4);
                    break;
                default:
                    abort();
            }
            break;
        case Ad16:
            printf("\tuaecptr %sa = xm68k_areg (%s) + (uae_s32)(uae_s16)%s;\n", name, reg, gen_nextiword());
            break;
        case Ad8r:
            if (cpu_level > 1)
            {
                if (next_cpu_level < 1)
                    next_cpu_level = 1;
                sync_m68k_pc();
                start_brace();
                /* This would ordinarily be done in gen_nextiword, which we bypass.  */
                printf("\tuaecptr %sa = xget_disp_ea_020 (xm68k_areg (%s), xnext_iword ());\n", name, reg);
            }
            else
                printf("\tuaecptr %sa = xget_disp_ea_000 (xm68k_areg (%s), %s);\n", name, reg, gen_nextiword());

            break;
        case PC16:
            printf("\tuaecptr %sa = xm68k_getpc () + %d;\n", name, m68k_pc_offset);
            printf("\t%sa += (uae_s32)(uae_s16)%s;\n", name, gen_nextiword());
            break;
        case PC8r:
            if (cpu_level > 1)
            {
                if (next_cpu_level < 1)
                    next_cpu_level = 1;
                sync_m68k_pc();
                start_brace();
                /* This would ordinarily be done in gen_nextiword, which we bypass.  */
                printf("\tuaecptr tmppc = xm68k_getpc ();\n");
                printf("\tuaecptr %sa = xget_disp_ea_020(tmppc, xnext_iword ());\n", name);
            }
            else
            {
                printf("\tuaecptr tmppc = xm68k_getpc () + %d;\n", m68k_pc_offset);
                printf("\tuaecptr %sa = xget_disp_ea_000 (tmppc, %s);\n", name, gen_nextiword());
            }

            break;
        case absw:
            printf("\tuaecptr %sa = (uae_s32)(uae_s16)%s;\n", name, gen_nextiword());
            break;
        case absl:
            printf("\tuaecptr %sa = %s;\n", name, gen_nextilong());
            break;
        case imm:
            if (getv != 1)
                abort();
            switch (size)
            {
                case sz_byte:
                    printf("\tuae_s8 %s = %s;\n", name, gen_nextibyte());
                    break;
                case sz_word:
                    printf("\tuae_s16 %s = %s;\n", name, gen_nextiword());
                    break;
                case sz_long:
                    printf("\tuae_s32 %s = %s;\n", name, gen_nextilong());
                    break;
                default:
                    abort();
            }
            return;
        case imm0:
            if (getv != 1)
                abort();
            printf("\tuae_s8 %s = %s;\n", name, gen_nextibyte());
            return;
        case imm1:
            if (getv != 1)
                abort();
            printf("\tuae_s16 %s = %s;\n", name, gen_nextiword());
            return;
        case imm2:
            if (getv != 1)
                abort();
            printf("\tuae_s32 %s = %s;\n", name, gen_nextilong());
            return;
        case immi:
            if (getv != 1)
                abort();
            printf("\tuae_u32 %s = %s;\n", name, reg);
            return;
        default:
            abort();
    }

    if (getv == 1)
    {
        start_brace();
        switch (size)
        {
            case sz_byte: printf("\tuae_s8 %s = xget_byte (%sa);\n", name, name); break;
            case sz_word: printf("\tuae_s16 %s = xget_word (%sa);\n", name, name); break;
            case sz_long: printf("\tuae_s32 %s = xget_long (%sa);\n", name, name); break;
            default: abort();
        }
    }

    /* We now might have to fix up the register for pre-dec or post-inc
     * addressing modes. */
    if (!movem)
        switch (mode)
        {
            case Aipi:
                switch (size)
                {
                    case sz_byte:
                        printf("\txm68k_areg (%s) += xareg_byteinc[%s];\n", reg, reg);
                        break;
                    case sz_word:
                        printf("\txm68k_areg (%s) += 2;\n", reg);
                        break;
                    case sz_long:
                        printf("\txm68k_areg (%s) += 4;\n", reg);
                        break;
                    default:
                        abort();
                }
                break;
            case Apdi:
                printf("\txm68k_areg (%s) = %sa;\n", reg, name);
                break;
            default:
                break;
        }
}

static void genastore(char* from, amodes mode, char* reg, wordsizes size, char* to)
{
    switch (mode)
    {
        case Dreg:
            switch (size)
            {
                case sz_byte:
                    printf("\txm68k_dreg (%s) = (xm68k_dreg (%s) & ~0xff) | ((%s) & 0xff);\n", reg, reg, from);
                    break;
                case sz_word:
                    printf("\txm68k_dreg (%s) = (xm68k_dreg (%s) & ~0xffff) | ((%s) & 0xffff);\n", reg, reg, from);
                    break;
                case sz_long:
                    printf("\txm68k_dreg (%s) = (%s);\n", reg, from);
                    break;
                default:
                    abort();
            }
            break;
        case Areg:
            switch (size)
            {
                case sz_word:
                    printf("\txm68k_areg (%s) = (uae_s32)(uae_s16)(%s);\n", reg, from);
                    break;
                case sz_long:
                    printf("\txm68k_areg (%s) = (%s);\n", reg, from);
                    break;
                default:
                    abort();
            }
            break;
        case Aind:
        case Aipi:
        case Apdi:
        case Ad16:
        case Ad8r:
        case absw:
        case absl:
        case PC16:
        case PC8r:
            if (using_prefetch)
                sync_m68k_pc();
            switch (size)
            {
                case sz_byte:
                    printf("\txput_byte (%sa,%s);\n", to, from);
                    break;
                case sz_word:
                    if (cpu_level < 2 && (mode == PC16 || mode == PC8r))
                        abort();
                    printf("\txput_word (%sa,%s);\n", to, from);
                    break;
                case sz_long:
                    if (cpu_level < 2 && (mode == PC16 || mode == PC8r))
                        abort();
                    printf("\txput_long (%sa,%s);\n", to, from);
                    break;
                default:
                    abort();
            }
            break;
        case imm:
        case imm0:
        case imm1:
        case imm2:
        case immi:
            abort();
            break;
        default:
            abort();
    }
}

static void genmovemel(uae_u16 opcode)
{
    char getcode[100];
    int size = table68k[opcode].size == sz_long ? 4 : 2;

    if (table68k[opcode].size == sz_long)
    {
        strcpy(getcode, "xget_long (srca)");
    }
    else
    {
        strcpy(getcode, "(uae_s32)(uae_s16)xget_word (srca)");
    }

    printf("\tuae_u16 mask = %s;\n", gen_nextiword());
    printf("\tunsigned int dmask = mask & 0xff, amask = (mask >> 8) & 0xff;\n");
    genamode(table68k[opcode].dmode, "dstreg", table68k[opcode].size, "src", 2, 1);
    start_brace();
    printf("\twhile (dmask) { xm68k_dreg (xmovem_index1[dmask]) = %s; srca += %d; dmask = xmovem_next[dmask]; }\n",
           getcode, size);
    printf("\twhile (amask) { xm68k_areg (xmovem_index1[amask]) = %s; srca += %d; amask = xmovem_next[amask]; }\n",
           getcode, size);

    if (table68k[opcode].dmode == Aipi)
        printf("\txm68k_areg (dstreg) = srca;\n");
}

static void genmovemle(uae_u16 opcode)
{
    char putcode[100];
    int size = table68k[opcode].size == sz_long ? 4 : 2;
    if (table68k[opcode].size == sz_long)
    {
        strcpy(putcode, "xput_long (srca,");
    }
    else
    {
        strcpy(putcode, "xput_word (srca,");
    }

    printf("\tuae_u16 mask = %s;\n", gen_nextiword());
    genamode(table68k[opcode].dmode, "dstreg", table68k[opcode].size, "src", 2, 1);
    if (using_prefetch)
        sync_m68k_pc();

    start_brace();
    if (table68k[opcode].dmode == Apdi)
    {
        printf("\tuae_u16 amask = mask & 0xff, dmask = (mask >> 8) & 0xff;\n");
        printf("\twhile (amask) { srca -= %d; %s xm68k_areg (xmovem_index2[amask])); amask = xmovem_next[amask]; }\n",
               size, putcode);
        printf("\twhile (dmask) { srca -= %d; %s xm68k_dreg (xmovem_index2[dmask])); dmask = xmovem_next[dmask]; }\n",
               size, putcode);
        printf("\txm68k_areg (dstreg) = srca;\n");
    }
    else
    {
        printf("\tuae_u16 dmask = mask & 0xff, amask = (mask >> 8) & 0xff;\n");
        printf("\twhile (dmask) { %s xm68k_dreg (xmovem_index1[dmask])); srca += %d; dmask = xmovem_next[dmask]; }\n",
               putcode, size);
        printf("\twhile (amask) { %s xm68k_areg (xmovem_index1[amask])); srca += %d; amask = xmovem_next[amask]; }\n",
               putcode, size);
    }
}

static void duplicate_carry(void)
{
    printf("\tXCOPY_CARRY;\n");
}

typedef enum
{
    flag_logical_noclobber, flag_logical, flag_add, flag_sub, flag_cmp, flag_addx, flag_subx, flag_zn,
    flag_av, flag_sv
}
flagtypes;

static void genflags_normal(flagtypes type, wordsizes size, char* value, char* src, char* dst)
{
    char vstr[100], sstr[100], dstr[100];
    char usstr[100], udstr[100];
    char unsstr[100], undstr[100];

    switch (size)
    {
        case sz_byte:
            strcpy(vstr, "((uae_s8)(");
            strcpy(usstr, "((uae_u8)(");
            break;
        case sz_word:
            strcpy(vstr, "((uae_s16)(");
            strcpy(usstr, "((uae_u16)(");
            break;
        case sz_long:
            strcpy(vstr, "((uae_s32)(");
            strcpy(usstr, "((uae_u32)(");
            break;
        default:
            abort();
    }
    strcpy(unsstr, usstr);

    strcpy(sstr, vstr);
    strcpy(dstr, vstr);
    strcat(vstr, value);
    strcat(vstr, "))");
    strcat(dstr, dst);
    strcat(dstr, "))");
    strcat(sstr, src);
    strcat(sstr, "))");

    strcpy(udstr, usstr);
    strcat(udstr, dst);
    strcat(udstr, "))");
    strcat(usstr, src);
    strcat(usstr, "))");

    strcpy(undstr, unsstr);
    strcat(unsstr, "-");
    strcat(undstr, "~");
    strcat(undstr, dst);
    strcat(undstr, "))");
    strcat(unsstr, src);
    strcat(unsstr, "))");

    switch (type)
    {
        case flag_logical_noclobber:
        case flag_logical:
        case flag_zn:
        case flag_av:
        case flag_sv:
        case flag_addx:
        case flag_subx:
            break;

        case flag_add:
            start_brace();
            printf("uae_u32 %s = %s + %s;\n", value, dstr, sstr);
            break;
        case flag_sub:
        case flag_cmp:
            start_brace();
            printf("uae_u32 %s = %s - %s;\n", value, dstr, sstr);
            break;
    }

    switch (type)
    {
        case flag_logical_noclobber:
        case flag_logical:
        case flag_zn:
            break;

        case flag_add:
        case flag_sub:
        case flag_addx:
        case flag_subx:
        case flag_cmp:
        case flag_av:
        case flag_sv:
            start_brace();
            printf("\t" BOOL_TYPE " flgs = %s < 0;\n", sstr);
            printf("\t" BOOL_TYPE " flgo = %s < 0;\n", dstr);
            printf("\t" BOOL_TYPE " flgn = %s < 0;\n", vstr);
            break;
    }

    switch (type)
    {
        case flag_logical:
            printf("\tXCLEAR_CZNV;\n");
            printf("\tXSET_ZFLG (%s == 0);\n", vstr);
            printf("\tXSET_NFLG (%s < 0);\n", vstr);
            break;
        case flag_logical_noclobber:
            printf("\tXSET_ZFLG (%s == 0);\n", vstr);
            printf("\tXSET_NFLG (%s < 0);\n", vstr);
            break;
        case flag_av:
            printf("\tXSET_VFLG ((flgs ^ flgn) & (flgo ^ flgn));\n");
            break;
        case flag_sv:
            printf("\tXSET_VFLG ((flgs ^ flgo) & (flgn ^ flgo));\n");
            break;
        case flag_zn:
            printf("\tXSET_ZFLG (XGET_ZFLG & (%s == 0));\n", vstr);
            printf("\tXSET_NFLG (%s < 0);\n", vstr);
            break;
        case flag_add:
            printf("\tXSET_ZFLG (%s == 0);\n", vstr);
            printf("\tXSET_VFLG ((flgs ^ flgn) & (flgo ^ flgn));\n");
            printf("\tXSET_CFLG (%s < %s);\n", undstr, usstr);
            duplicate_carry();
            printf("\tXSET_NFLG (flgn != 0);\n");
            break;
        case flag_sub:
            printf("\tXSET_ZFLG (%s == 0);\n", vstr);
            printf("\tXSET_VFLG ((flgs ^ flgo) & (flgn ^ flgo));\n");
            printf("\tXSET_CFLG (%s > %s);\n", usstr, udstr);
            duplicate_carry();
            printf("\tXSET_NFLG (flgn != 0);\n");
            break;
        case flag_addx:
            printf("\tXSET_VFLG ((flgs ^ flgn) & (flgo ^ flgn));\n"); /* minterm SON: 0x42 */
            printf("\tXSET_CFLG (flgs ^ ((flgs ^ flgo) & (flgo ^ flgn)));\n"); /* minterm SON: 0xD4 */
            duplicate_carry();
            break;
        case flag_subx:
            printf("\tXSET_VFLG ((flgs ^ flgo) & (flgo ^ flgn));\n"); /* minterm SON: 0x24 */
            printf("\tXSET_CFLG (flgs ^ ((flgs ^ flgn) & (flgo ^ flgn)));\n"); /* minterm SON: 0xB2 */
            duplicate_carry();
            break;
        case flag_cmp:
            printf("\tXSET_ZFLG (%s == 0);\n", vstr);
            printf("\tXSET_VFLG ((flgs != flgo) && (flgn != flgo));\n");
            printf("\tXSET_CFLG (%s > %s);\n", usstr, udstr);
            printf("\tXSET_NFLG (flgn != 0);\n");
            break;
    }
}

static void genflags(flagtypes type, wordsizes size, char* value, char* src, char* dst)
{
    /* Temporarily deleted 68k/ARM flag optimizations.  I'd prefer to have
       them in the appropriate m68k.h files and use just one copy of this
       code here.  The API can be changed if necessary.  */
    #ifdef OPTIMIZED_FLAGS
    switch (type)
    {
        case flag_add:
        case flag_sub:
            start_brace();
            printf("\tuae_u32 %s;\n", value);
            break;

        default:
            break;
    }

    /* At least some of those casts are fairly important! */
    switch (type)
    {
        case flag_logical_noclobber:
            printf("\t{uae_u32 oldcznv = GET_CZNV & ~(FLAGVAL_Z | FLAGVAL_N);\n");
            if (strcmp(value, "0") == 0)
            {
                printf("\tSET_CZNV (olcznv | FLAGVAL_Z);\n");
            }
            else
            {
                switch (size)
                {
                    case sz_byte: printf("\toptflag_testb ((uae_s8)(%s));\n", value); break;
                    case sz_word: printf("\toptflag_testw ((uae_s16)(%s));\n", value); break;
                    case sz_long: printf("\toptflag_testl ((uae_s32)(%s));\n", value); break;
                }
                printf("\tIOR_CZNV (oldcznv);\n");
            }
            printf("\t}\n");
            return;
        case flag_logical:
            if (strcmp(value, "0") == 0)
            {
                printf("\tSET_CZNV (FLAGVAL_Z);\n");
            }
            else
            {
                switch (size)
                {
                    case sz_byte: printf("\toptflag_testb ((uae_s8)(%s));\n", value); break;
                    case sz_word: printf("\toptflag_testw ((uae_s16)(%s));\n", value); break;
                    case sz_long: printf("\toptflag_testl ((uae_s32)(%s));\n", value); break;
                }
            }
            return;

        case flag_add:
            switch (size)
            {
                case sz_byte: printf("\toptflag_addb (%s, (uae_s8)(%s), (uae_s8)(%s));\n", value, src, dst); break;
                case sz_word: printf("\toptflag_addw (%s, (uae_s16)(%s), (uae_s16)(%s));\n", value, src, dst); break;
                case sz_long: printf("\toptflag_addl (%s, (uae_s32)(%s), (uae_s32)(%s));\n", value, src, dst); break;
            }
            return;

        case flag_sub:
            switch (size)
            {
                case sz_byte: printf("\toptflag_subb (%s, (uae_s8)(%s), (uae_s8)(%s));\n", value, src, dst); break;
                case sz_word: printf("\toptflag_subw (%s, (uae_s16)(%s), (uae_s16)(%s));\n", value, src, dst); break;
                case sz_long: printf("\toptflag_subl (%s, (uae_s32)(%s), (uae_s32)(%s));\n", value, src, dst); break;
            }
            return;

        case flag_cmp:
            switch (size)
            {
                case sz_byte: printf("\toptflag_cmpb ((uae_s8)(%s), (uae_s8)(%s));\n", src, dst); break;
                case sz_word: printf("\toptflag_cmpw ((uae_s16)(%s), (uae_s16)(%s));\n", src, dst); break;
                case sz_long: printf("\toptflag_cmpl ((uae_s32)(%s), (uae_s32)(%s));\n", src, dst); break;
            }
            return;

        default:
            break;
    }
    #endif

    genflags_normal(type, size, value, src, dst);
}

static void force_range_for_rox(const char* var, wordsizes size)
{
    /* Could do a modulo operation here... which one is faster? */
    switch (size)
    {
        case sz_long:
            printf("\tif (%s >= 33) %s -= 33;\n", var, var);
            break;
        case sz_word:
            printf("\tif (%s >= 34) %s -= 34;\n", var, var);
            printf("\tif (%s >= 17) %s -= 17;\n", var, var);
            break;
        case sz_byte:
            printf("\tif (%s >= 36) %s -= 36;\n", var, var);
            printf("\tif (%s >= 18) %s -= 18;\n", var, var);
            printf("\tif (%s >= 9) %s -= 9;\n", var, var);
            break;
    }
}

static const char * cmask(wordsizes size)
{
    switch (size)
    {
        case sz_byte: return "0x80";
        case sz_word: return "0x8000";
        case sz_long: return "0x80000000";
        default: abort();
    }
}

static int source_is_imm1_8(struct instr* i)
{
    return i->stype == 3;
}

static void gen_opcode(unsigned long int opcode)
{
    struct instr* curi = table68k + opcode;

    switch (curi->plev)
    {
        case 0: /* not privileged */
            break;
        case 1: /* unprivileged only on 68000 */
            if (cpu_level == 0)
                break;
            if (next_cpu_level < 0)
                next_cpu_level = 0;

        /* fall through */
        case 2:
        case 3:
            return;
    }

    m68k_pc_offset = 2;
    start_brace();

    switch (curi->mnemo)
    {
        case i_OR:
        case i_AND:
        case i_EOR:
            genamode(curi->smode, "srcreg", curi->size, "src", 1, 0);
            genamode(curi->dmode, "dstreg", curi->size, "dst", 1, 0);
            printf("\tsrc %c= dst;\n", curi->mnemo == i_OR ? '|' : curi->mnemo == i_AND ? '&' : '^');
            genflags(flag_logical, curi->size, "src", "", "");
            genastore("src", curi->dmode, "dstreg", curi->size, "dst");
            break;
        case i_SUB:
            genamode(curi->smode, "srcreg", curi->size, "src", 1, 0);
            genamode(curi->dmode, "dstreg", curi->size, "dst", 1, 0);
            start_brace();
            genflags(flag_sub, curi->size, "newv", "src", "dst");
            genastore("newv", curi->dmode, "dstreg", curi->size, "dst");
            break;
        case i_SUBA:
            genamode(curi->smode, "srcreg", curi->size, "src", 1, 0);
            genamode(curi->dmode, "dstreg", sz_long, "dst", 1, 0);
            start_brace();
            printf("\tuae_u32 newv = dst - src;\n");
            genastore("newv", curi->dmode, "dstreg", sz_long, "dst");
            break;
        case i_SUBX:
            genamode(curi->smode, "srcreg", curi->size, "src", 1, 0);
            genamode(curi->dmode, "dstreg", curi->size, "dst", 1, 0);
            start_brace();
            printf("\tuae_u32 newv = dst - src - (XGET_XFLG ? 1 : 0);\n");
            genflags(flag_subx, curi->size, "newv", "src", "dst");
            genflags(flag_zn, curi->size, "newv", "", "");
            genastore("newv", curi->dmode, "dstreg", curi->size, "dst");
            break;
        case i_SBCD:
            genamode(curi->smode, "srcreg", curi->size, "src", 1, 0);
            genamode(curi->dmode, "dstreg", curi->size, "dst", 1, 0);
            start_brace();
            printf("\tuae_u16 newv_lo = (dst & 0xF) - (src & 0xF) - (XGET_XFLG ? 1 : 0);\n");
            printf("\tuae_u16 newv_hi = (dst & 0xF0) - (src & 0xF0);\n");
            printf("\tuae_u16 newv, tmp_newv;\n");
            printf("\tint bcd = 0;\n");
            printf("\tnewv = tmp_newv = newv_hi + newv_lo;\n");
            printf("\tif (newv_lo & 0xF0) { newv -= 6; bcd = 6; };\n");
            printf("\tif ((((dst & 0xFF) - (src & 0xFF) - (XGET_XFLG ? 1 : 0)) & 0x100) > 0xFF) { newv -= 0x60; }\n");
            printf("\tXSET_CFLG ((((dst & 0xFF) - (src & 0xFF) - bcd - (XGET_XFLG ? 1 : 0)) & 0x300) > 0xFF);\n");
            duplicate_carry();
            genflags(flag_zn, curi->size, "newv", "", "");
            printf("\tXSET_VFLG ((tmp_newv & 0x80) != 0 && (newv & 0x80) == 0);\n");
            genastore("newv", curi->dmode, "dstreg", curi->size, "dst");
            break;
        case i_ADD:
            genamode(curi->smode, "srcreg", curi->size, "src", 1, 0);
            genamode(curi->dmode, "dstreg", curi->size, "dst", 1, 0);
            start_brace();
            genflags(flag_add, curi->size, "newv", "src", "dst");
            genastore("newv", curi->dmode, "dstreg", curi->size, "dst");
            break;
        case i_ADDA:
            genamode(curi->smode, "srcreg", curi->size, "src", 1, 0);
            genamode(curi->dmode, "dstreg", sz_long, "dst", 1, 0);
            start_brace();
            printf("\tuae_u32 newv = dst + src;\n");
            genastore("newv", curi->dmode, "dstreg", sz_long, "dst");
            break;
        case i_ADDX:
            genamode(curi->smode, "srcreg", curi->size, "src", 1, 0);
            genamode(curi->dmode, "dstreg", curi->size, "dst", 1, 0);
            start_brace();
            printf("\tuae_u32 newv = dst + src + (XGET_XFLG ? 1 : 0);\n");
            genflags(flag_addx, curi->size, "newv", "src", "dst");
            genflags(flag_zn, curi->size, "newv", "", "");
            genastore("newv", curi->dmode, "dstreg", curi->size, "dst");
            break;
        case i_ABCD:
            genamode(curi->smode, "srcreg", curi->size, "src", 1, 0);
            genamode(curi->dmode, "dstreg", curi->size, "dst", 1, 0);
            start_brace();
            printf("\tuae_u16 newv_lo = (src & 0xF) + (dst & 0xF) + (XGET_XFLG ? 1 : 0);\n");
            printf("\tuae_u16 newv_hi = (src & 0xF0) + (dst & 0xF0);\n");
            printf("\tuae_u16 newv, tmp_newv;\n");
            printf("\tint cflg;\n");
            printf("\tnewv = tmp_newv = newv_hi + newv_lo;");
            printf("\tif (newv_lo > 9) { newv += 6; }\n");
            printf("\tcflg = (newv & 0x3F0) > 0x90;\n");
            printf("\tif (cflg) newv += 0x60;\n");
            printf("\tXSET_CFLG (cflg);\n");
            duplicate_carry();
            genflags(flag_zn, curi->size, "newv", "", "");
            printf("\tXSET_VFLG ((tmp_newv & 0x80) == 0 && (newv & 0x80) != 0);\n");
            genastore("newv", curi->dmode, "dstreg", curi->size, "dst");
            break;
        case i_NEG:
            genamode(curi->smode, "srcreg", curi->size, "src", 1, 0);
            start_brace();
            genflags(flag_sub, curi->size, "dst", "src", "0");
            genastore("dst", curi->smode, "srcreg", curi->size, "src");
            break;
        case i_NEGX:
            genamode(curi->smode, "srcreg", curi->size, "src", 1, 0);
            start_brace();
            printf("\tuae_u32 newv = 0 - src - (XGET_XFLG ? 1 : 0);\n");
            genflags(flag_subx, curi->size, "newv", "src", "0");
            genflags(flag_zn, curi->size, "newv", "", "");
            genastore("newv", curi->smode, "srcreg", curi->size, "src");
            break;
        case i_NBCD:
            genamode(curi->smode, "srcreg", curi->size, "src", 1, 0);
            start_brace();
            printf("\tuae_u16 newv_lo = - (src & 0xF) - (XGET_XFLG ? 1 : 0);\n");
            printf("\tuae_u16 newv_hi = - (src & 0xF0);\n");
            printf("\tuae_u16 newv;\n");
            printf("\tint cflg;\n");
            printf("\tif (newv_lo > 9) { newv_lo -= 6; }\n");
            printf("\tnewv = newv_hi + newv_lo;");
            printf("\tcflg = (newv & 0x1F0) > 0x90;\n");
            printf("\tif (cflg) newv -= 0x60;\n");
            printf("\tXSET_CFLG (cflg);\n");
            duplicate_carry();
            genflags(flag_zn, curi->size, "newv", "", "");
            genastore("newv", curi->smode, "srcreg", curi->size, "src");
            break;
        case i_CLR:
            genamode(curi->smode, "srcreg", curi->size, "src", 2, 0);
            genflags(flag_logical, curi->size, "0", "", "");
            genastore("0", curi->smode, "srcreg", curi->size, "src");
            break;
        case i_NOT:
            genamode(curi->smode, "srcreg", curi->size, "src", 1, 0);
            start_brace();
            printf("\tuae_u32 dst = ~src;\n");
            genflags(flag_logical, curi->size, "dst", "", "");
            genastore("dst", curi->smode, "srcreg", curi->size, "src");
            break;
        case i_TST:
            genamode(curi->smode, "srcreg", curi->size, "src", 1, 0);
            genflags(flag_logical, curi->size, "src", "", "");
            break;
        case i_BTST:
            genamode(curi->smode, "srcreg", curi->size, "src", 1, 0);
            genamode(curi->dmode, "dstreg", curi->size, "dst", 1, 0);
            if (curi->size == sz_byte)
                printf("\tsrc &= 7;\n");
            else
                printf("\tsrc &= 31;\n");
            printf("\tXSET_ZFLG (1 ^ ((dst >> src) & 1));\n");
            break;
        case i_BCHG:
            genamode(curi->smode, "srcreg", curi->size, "src", 1, 0);
            genamode(curi->dmode, "dstreg", curi->size, "dst", 1, 0);
            if (curi->size == sz_byte)
                printf("\tsrc &= 7;\n");
            else
                printf("\tsrc &= 31;\n");
            printf("\tdst ^= (1 << src);\n");
            printf("\tXSET_ZFLG (((uae_u32)dst & (1 << src)) >> src);\n");
            genastore("dst", curi->dmode, "dstreg", curi->size, "dst");
            break;
        case i_BCLR:
            genamode(curi->smode, "srcreg", curi->size, "src", 1, 0);
            genamode(curi->dmode, "dstreg", curi->size, "dst", 1, 0);
            if (curi->size == sz_byte)
                printf("\tsrc &= 7;\n");
            else
                printf("\tsrc &= 31;\n");
            printf("\tXSET_ZFLG (1 ^ ((dst >> src) & 1));\n");
            printf("\tdst &= ~(1 << src);\n");
            genastore("dst", curi->dmode, "dstreg", curi->size, "dst");
            break;
        case i_BSET:
            genamode(curi->smode, "srcreg", curi->size, "src", 1, 0);
            genamode(curi->dmode, "dstreg", curi->size, "dst", 1, 0);
            if (curi->size == sz_byte)
                printf("\tsrc &= 7;\n");
            else
                printf("\tsrc &= 31;\n");
            printf("\tXSET_ZFLG (1 ^ ((dst >> src) & 1));\n");
            printf("\tdst |= (1 << src);\n");
            genastore("dst", curi->dmode, "dstreg", curi->size, "dst");
            break;
        case i_CMPM:
        case i_CMP:
            genamode(curi->smode, "srcreg", curi->size, "src", 1, 0);
            genamode(curi->dmode, "dstreg", curi->size, "dst", 1, 0);
            start_brace();
            genflags(flag_cmp, curi->size, "newv", "src", "dst");
            break;
        case i_CMPA:
            genamode(curi->smode, "srcreg", curi->size, "src", 1, 0);
            genamode(curi->dmode, "dstreg", sz_long, "dst", 1, 0);
            start_brace();
            genflags(flag_cmp, sz_long, "newv", "src", "dst");
            break;
        /* The next two are coded a little unconventional, but they are doing
         * weird things... */
        case i_MVPRM:
            genamode(curi->smode, "srcreg", curi->size, "src", 1, 0);

            printf("\tuaecptr memp = xm68k_areg (dstreg) + (uae_s32)(uae_s16)%s;\n", gen_nextiword());
            if (curi->size == sz_word)
            {
                printf("\txput_byte (memp, src >> 8); xput_byte (memp + 2, src);\n");
            }
            else
            {
                printf("\txput_byte (memp, src >> 24); xput_byte (memp + 2, src >> 16);\n");
                printf("\txput_byte (memp + 4, src >> 8); xput_byte (memp + 6, src);\n");
            }
            break;
        case i_MVPMR:
            printf("\tuaecptr memp = xm68k_areg (srcreg) + (uae_s32)(uae_s16)%s;\n", gen_nextiword());
            genamode(curi->dmode, "dstreg", curi->size, "dst", 2, 0);
            if (curi->size == sz_word)
            {
                printf("\tuae_u16 val = (xget_byte (memp) << 8) + xget_byte (memp + 2);\n");
            }
            else
            {
                printf("\tuae_u32 val = (xget_byte (memp) << 24) + (xget_byte (memp + 2) << 16)\n");
                printf("              + (xget_byte (memp + 4) << 8) + xget_byte (memp + 6);\n");
            }
            genastore("val", curi->dmode, "dstreg", curi->size, "dst");
            break;
        case i_MOVE:
            genamode(curi->smode, "srcreg", curi->size, "src", 1, 0);
            genamode(curi->dmode, "dstreg", curi->size, "dst", 2, 0);
            genflags(flag_logical, curi->size, "src", "", "");
            genastore("src", curi->dmode, "dstreg", curi->size, "dst");
            break;
        case i_MOVEA:
            genamode(curi->smode, "srcreg", curi->size, "src", 1, 0);
            genamode(curi->dmode, "dstreg", curi->size, "dst", 2, 0);
            if (curi->size == sz_word)
            {
                printf("\tuae_u32 val = (uae_s32)(uae_s16)src;\n");
            }
            else
            {
                printf("\tuae_u32 val = src;\n");
            }
            genastore("val", curi->dmode, "dstreg", sz_long, "dst");
            break;
        case i_SWAP:
            genamode(curi->smode, "srcreg", sz_long, "src", 1, 0);
            start_brace();
            printf("\tuae_u32 dst = ((src >> 16)&0xFFFF) | ((src&0xFFFF)<<16);\n");
            genflags(flag_logical, sz_long, "dst", "", "");
            genastore("dst", curi->smode, "srcreg", sz_long, "src");
            break;
        case i_EXG:
            genamode(curi->smode, "srcreg", curi->size, "src", 1, 0);
            genamode(curi->dmode, "dstreg", curi->size, "dst", 1, 0);
            genastore("dst", curi->smode, "srcreg", curi->size, "src");
            genastore("src", curi->dmode, "dstreg", curi->size, "dst");
            break;
        case i_EXT:
            genamode(curi->smode, "srcreg", sz_long, "src", 1, 0);
            start_brace();
            switch (curi->size)
            {
                case sz_byte: printf("\tuae_u32 dst = (uae_s32)(uae_s8)src;\n"); break;
                case sz_word: printf("\tuae_u16 dst = (uae_s16)(uae_s8)src;\n"); break;
                case sz_long: printf("\tuae_u32 dst = (uae_s32)(uae_s16)src;\n"); break;
                default: abort();
            }
            genflags(flag_logical,
                     curi->size == sz_word ? sz_word : sz_long, "dst", "", "");
            genastore("dst", curi->smode, "srcreg",
                      curi->size == sz_word ? sz_word : sz_long, "src");
            break;
        case i_MVMEL:
            genmovemel(opcode);
            break;
        case i_MVMLE:
            genmovemle(opcode);
            break;
        case i_NOP:
            break;
        case i_LINK:
            genamode(Apdi, "7", sz_long, "old", 2, 0);
            genamode(curi->smode, "srcreg", sz_long, "src", 1, 0);
            genastore("src", Apdi, "7", sz_long, "old");
            genastore("xm68k_areg (7)", curi->smode, "srcreg", sz_long, "src");
            genamode(curi->dmode, "dstreg", curi->size, "offs", 1, 0);
            printf("\txm68k_areg (7) += offs;\n");
            break;
        case i_UNLK:
            genamode(curi->smode, "srcreg", curi->size, "src", 1, 0);
            printf("\txm68k_areg (7) = src;\n");
            genamode(Aipi, "7", sz_long, "old", 1, 0);
            genastore("old", curi->smode, "srcreg", curi->size, "src");
            break;
        case i_RTS:
            printf("\txm68k_setpc (xget_long (xm68k_areg (7)));\n");
            printf("\txm68k_areg (7) += 4;\n");
            m68k_pc_offset = 0;
            break;
        case i_JSR:
            genamode(curi->smode, "srcreg", curi->size, "src", 0, 0);
            printf("\txm68k_areg (7) -= 4;\n");
            printf("\txput_long (xm68k_areg (7), xm68k_getpc () + %d);\n", m68k_pc_offset);
            printf("\txm68k_setpc (srca);\n");
            m68k_pc_offset = 0;
            break;
        case i_JMP:
            genamode(curi->smode, "srcreg", curi->size, "src", 0, 0);
            printf("\txm68k_setpc (srca);\n");
            m68k_pc_offset = 0;
            break;
        case i_BSR:
            genamode(curi->smode, "srcreg", curi->size, "src", 1, 0);
            printf("\tuae_s32 s = (uae_s32)src + 2;\n");
            printf("\txm68k_areg (7) -= 4;\n");
            printf("\txput_long (xm68k_areg (7), xm68k_getpc () + %d);\n", m68k_pc_offset);
            printf("\txm68k_incpc(s);\n");
            m68k_pc_offset = 0;
            break;
        case i_Bcc:
            if (curi->size == sz_long)
            {
                if (next_cpu_level < 1)
                    next_cpu_level = 1;
            }
            genamode(curi->smode, "srcreg", curi->size, "src", 1, 0);
            printf("\tif (!xcctrue(%d)) goto didnt_jump;\n", curi->cc);
            printf("\txm68k_incpc ((uae_s32)src + 2);\n");
            printf("\treturn;\n");
            printf("didnt_jump:;\n");
            need_endlabel = 1;
            break;
        case i_LEA:
            genamode(curi->smode, "srcreg", curi->size, "src", 0, 0);
            genamode(curi->dmode, "dstreg", curi->size, "dst", 2, 0);
            genastore("srca", curi->dmode, "dstreg", curi->size, "dst");
            break;
        case i_PEA:
            genamode(curi->smode, "srcreg", curi->size, "src", 0, 0);
            genamode(Apdi, "7", sz_long, "dst", 2, 0);
            genastore("srca", Apdi, "7", sz_long, "dst");
            break;
        case i_DBcc:
            genamode(curi->smode, "srcreg", curi->size, "src", 1, 0);
            genamode(curi->dmode, "dstreg", curi->size, "offs", 1, 0);
            printf("\tif (!xcctrue(%d)) {\n", curi->cc);
            genastore("(src-1)", curi->smode, "srcreg", curi->size, "src");
            printf("\t\tif (src) {\n");
            printf("\t\t\txm68k_incpc((uae_s32)offs + 2);\n");
            printf("\t\t}\n");
            printf("\t}\n");
            need_endlabel = 1;
            break;
        case i_Scc:
            genamode(curi->smode, "srcreg", curi->size, "src", 2, 0);
            start_brace();
            printf("\tint val = xcctrue(%d) ? 0xff : 0;\n", curi->cc);
            genastore("val", curi->smode, "srcreg", curi->size, "src");
            break;
        case i_DIVU:
            printf("\tuaecptr oldpc = xm68k_getpc ();\n");
            genamode(curi->smode, "srcreg", sz_word, "src", 1, 0);
            genamode(curi->dmode, "dstreg", sz_long, "dst", 1, 0);
            sync_m68k_pc();
            start_brace();
            /* Clear V flag when dividing by zero - Alcatraz Odyssey demo depends
             * on this (actually, it's doing a DIVS).  */
            printf("\tuae_u32 newv = (uae_u32)dst / (uae_u32)(uae_u16)src;\n");
            printf("\tuae_u32 rem = (uae_u32)dst %% (uae_u32)(uae_u16)src;\n");
            /* The N flag appears to be set each time there is an overflow.
             * Weird. */
            printf("\tif (newv > 0xffff) { XSET_VFLG (1); XSET_NFLG (1); XSET_CFLG (0); } else\n\t{\n");
            genflags(flag_logical, sz_word, "newv", "", "");
            printf("\tnewv = (newv & 0xffff) | ((uae_u32)rem << 16);\n");
            genastore("newv", curi->dmode, "dstreg", sz_long, "dst");
            printf("\t}\n");
            need_endlabel = 1;
            break;
        case i_DIVS:
            printf("\tuaecptr oldpc = xm68k_getpc ();\n");
            genamode(curi->smode, "srcreg", sz_word, "src", 1, 0);
            genamode(curi->dmode, "dstreg", sz_long, "dst", 1, 0);
            sync_m68k_pc();
            start_brace();
            printf("\tuae_s32 newv = (uae_s32)dst / (uae_s32)(uae_s16)src;\n");
            printf("\tuae_u16 rem = (uae_s32)dst %% (uae_s32)(uae_s16)src;\n");
            printf("\tif ((newv & 0xffff8000) != 0 && (newv & 0xffff8000) != 0xffff8000) { XSET_VFLG (1); XSET_NFLG (1); XSET_CFLG (0); } else\n\t{\n");
            printf("\tif (((uae_s16)rem < 0) != ((uae_s32)dst < 0)) rem = -rem;\n");
            genflags(flag_logical, sz_word, "newv", "", "");
            printf("\tnewv = (newv & 0xffff) | ((uae_u32)rem << 16);\n");
            genastore("newv", curi->dmode, "dstreg", sz_long, "dst");
            printf("\t}\n");
            need_endlabel = 1;
            break;
        case i_MULU:
            genamode(curi->smode, "srcreg", sz_word, "src", 1, 0);
            genamode(curi->dmode, "dstreg", sz_word, "dst", 1, 0);
            start_brace();
            printf("\tuae_u32 newv = (uae_u32)(uae_u16)dst * (uae_u32)(uae_u16)src;\n");
            genflags(flag_logical, sz_long, "newv", "", "");
            genastore("newv", curi->dmode, "dstreg", sz_long, "dst");
            break;
        case i_MULS:
            genamode(curi->smode, "srcreg", sz_word, "src", 1, 0);
            genamode(curi->dmode, "dstreg", sz_word, "dst", 1, 0);
            start_brace();
            printf("\tuae_u32 newv = (uae_s32)(uae_s16)dst * (uae_s32)(uae_s16)src;\n");
            genflags(flag_logical, sz_long, "newv", "", "");
            genastore("newv", curi->dmode, "dstreg", sz_long, "dst");
            break;
        case i_ASR:
            genamode(curi->smode, "srcreg", curi->size, "cnt", 1, 0);
            genamode(curi->dmode, "dstreg", curi->size, "data", 1, 0);
            start_brace();
            switch (curi->size)
            {
                case sz_byte: printf("\tuae_u32 val = (uae_u8)data;\n"); break;
                case sz_word: printf("\tuae_u32 val = (uae_u16)data;\n"); break;
                case sz_long: printf("\tuae_u32 val = data;\n"); break;
                default: abort();
            }
            printf("\tuae_u32 sign = (%s & val) >> %d;\n", cmask(curi->size), bit_size(curi->size) - 1);
            printf("\tcnt &= 63;\n");
            printf("\tXCLEAR_CZNV;\n");
            printf("\tif (cnt >= %d) {\n", bit_size(curi->size));
            printf("\t\tval = %s & (uae_u32)-sign;\n", bit_mask(curi->size));
            printf("\t\tXSET_CFLG (sign);\n");
            duplicate_carry();
            if (source_is_imm1_8(curi))
                printf("\t} else {\n");
            else
                printf("\t} else if (cnt > 0) {\n");
            printf("\t\tval >>= cnt - 1;\n");
            printf("\t\tXSET_CFLG (val & 1);\n");
            duplicate_carry();
            printf("\t\tval >>= 1;\n");
            printf("\t\tval |= (%s << (%d - cnt)) & (uae_u32)-sign;\n",
                   bit_mask(curi->size),
                   bit_size(curi->size));
            printf("\t\tval &= %s;\n", bit_mask(curi->size));
            printf("\t}\n");
            genflags(flag_logical_noclobber, curi->size, "val", "", "");
            genastore("val", curi->dmode, "dstreg", curi->size, "data");
            break;
        case i_ASL:
            genamode(curi->smode, "srcreg", curi->size, "cnt", 1, 0);
            genamode(curi->dmode, "dstreg", curi->size, "data", 1, 0);
            start_brace();
            switch (curi->size)
            {
                case sz_byte: printf("\tuae_u32 val = (uae_u8)data;\n"); break;
                case sz_word: printf("\tuae_u32 val = (uae_u16)data;\n"); break;
                case sz_long: printf("\tuae_u32 val = data;\n"); break;
                default: abort();
            }
            printf("\tcnt &= 63;\n");
            printf("\tXCLEAR_CZNV;\n");
            printf("\tif (cnt >= %d) {\n", bit_size(curi->size));
            printf("\t\tXSET_VFLG (val != 0);\n");
            printf("\t\tXSET_CFLG (cnt == %d ? val & 1 : 0);\n",
                   bit_size(curi->size));
            duplicate_carry();
            printf("\t\tval = 0;\n");
            if (source_is_imm1_8(curi))
                printf("\t} else {\n");
            else
                printf("\t} else if (cnt > 0) {\n");
            printf("\t\tuae_u32 mask = (%s << (%d - cnt)) & %s;\n",
                   bit_mask(curi->size),
                   bit_size(curi->size) - 1,
                   bit_mask(curi->size));
            printf("\t\tXSET_VFLG ((val & mask) != mask && (val & mask) != 0);\n");
            printf("\t\tval <<= cnt - 1;\n");
            printf("\t\tXSET_CFLG ((val & %s) >> %d);\n", cmask(curi->size), bit_size(curi->size) - 1);
            duplicate_carry();
            printf("\t\tval <<= 1;\n");
            printf("\t\tval &= %s;\n", bit_mask(curi->size));
            printf("\t}\n");
            genflags(flag_logical_noclobber, curi->size, "val", "", "");
            genastore("val", curi->dmode, "dstreg", curi->size, "data");
            break;
        case i_LSR:
            genamode(curi->smode, "srcreg", curi->size, "cnt", 1, 0);
            genamode(curi->dmode, "dstreg", curi->size, "data", 1, 0);
            start_brace();
            switch (curi->size)
            {
                case sz_byte: printf("\tuae_u32 val = (uae_u8)data;\n"); break;
                case sz_word: printf("\tuae_u32 val = (uae_u16)data;\n"); break;
                case sz_long: printf("\tuae_u32 val = data;\n"); break;
                default: abort();
            }
            printf("\tcnt &= 63;\n");
            printf("\tXCLEAR_CZNV;\n");
            printf("\tif (cnt >= %d) {\n", bit_size(curi->size));
            printf("\t\tXSET_CFLG ((cnt == %d) & (val >> %d));\n",
                   bit_size(curi->size), bit_size(curi->size) - 1);
            duplicate_carry();
            printf("\t\tval = 0;\n");
            if (source_is_imm1_8(curi))
                printf("\t} else {\n");
            else
                printf("\t} else if (cnt > 0) {\n");
            printf("\t\tval >>= cnt - 1;\n");
            printf("\t\tXSET_CFLG (val & 1);\n");
            duplicate_carry();
            printf("\t\tval >>= 1;\n");
            printf("\t}\n");
            genflags(flag_logical_noclobber, curi->size, "val", "", "");
            genastore("val", curi->dmode, "dstreg", curi->size, "data");
            break;
        case i_LSL:
            genamode(curi->smode, "srcreg", curi->size, "cnt", 1, 0);
            genamode(curi->dmode, "dstreg", curi->size, "data", 1, 0);
            start_brace();
            switch (curi->size)
            {
                case sz_byte: printf("\tuae_u32 val = (uae_u8)data;\n"); break;
                case sz_word: printf("\tuae_u32 val = (uae_u16)data;\n"); break;
                case sz_long: printf("\tuae_u32 val = data;\n"); break;
                default: abort();
            }
            printf("\tcnt &= 63;\n");
            printf("\tXCLEAR_CZNV;\n");
            printf("\tif (cnt >= %d) {\n", bit_size(curi->size));
            printf("\t\tXSET_CFLG (cnt == %d ? val & 1 : 0);\n",
                   bit_size(curi->size));
            duplicate_carry();
            printf("\t\tval = 0;\n");
            if (source_is_imm1_8(curi))
                printf("\t} else {\n");
            else
                printf("\t} else if (cnt > 0) {\n");
            printf("\t\tval <<= (cnt - 1);\n");
            printf("\t\tXSET_CFLG ((val & %s) >> %d);\n", cmask(curi->size), bit_size(curi->size) - 1);
            duplicate_carry();
            printf("\t\tval <<= 1;\n");
            printf("\tval &= %s;\n", bit_mask(curi->size));
            printf("\t}\n");
            genflags(flag_logical_noclobber, curi->size, "val", "", "");
            genastore("val", curi->dmode, "dstreg", curi->size, "data");
            break;
        case i_ROL:
            genamode(curi->smode, "srcreg", curi->size, "cnt", 1, 0);
            genamode(curi->dmode, "dstreg", curi->size, "data", 1, 0);
            start_brace();
            switch (curi->size)
            {
                case sz_byte: printf("\tuae_u32 val = (uae_u8)data;\n"); break;
                case sz_word: printf("\tuae_u32 val = (uae_u16)data;\n"); break;
                case sz_long: printf("\tuae_u32 val = data;\n"); break;
                default: abort();
            }
            printf("\tcnt &= 63;\n");
            printf("\tXCLEAR_CZNV;\n");
            if (source_is_imm1_8(curi))
                printf("{");
            else
                printf("\tif (cnt > 0) {\n");
            printf("\tuae_u32 loval;\n");
            printf("\tcnt &= %d;\n", bit_size(curi->size) - 1);
            printf("\tloval = val >> (%d - cnt);\n", bit_size(curi->size));
            printf("\tval <<= cnt;\n");
            printf("\tval |= loval;\n");
            printf("\tval &= %s;\n", bit_mask(curi->size));
            printf("\tXSET_CFLG (val & 1);\n");
            printf("}\n");
            genflags(flag_logical_noclobber, curi->size, "val", "", "");
            genastore("val", curi->dmode, "dstreg", curi->size, "data");
            break;
        case i_ROR:
            genamode(curi->smode, "srcreg", curi->size, "cnt", 1, 0);
            genamode(curi->dmode, "dstreg", curi->size, "data", 1, 0);
            start_brace();
            switch (curi->size)
            {
                case sz_byte: printf("\tuae_u32 val = (uae_u8)data;\n"); break;
                case sz_word: printf("\tuae_u32 val = (uae_u16)data;\n"); break;
                case sz_long: printf("\tuae_u32 val = data;\n"); break;
                default: abort();
            }
            printf("\tcnt &= 63;\n");
            printf("\tXCLEAR_CZNV;\n");
            if (source_is_imm1_8(curi))
                printf("{");
            else
                printf("\tif (cnt > 0) {");
            printf("\tuae_u32 hival;\n");
            printf("\tcnt &= %d;\n", bit_size(curi->size) - 1);
            printf("\thival = val << (%d - cnt);\n", bit_size(curi->size));
            printf("\tval >>= cnt;\n");
            printf("\tval |= hival;\n");
            printf("\tval &= %s;\n", bit_mask(curi->size));
            printf("\tXSET_CFLG ((val & %s) >> %d);\n", cmask(curi->size), bit_size(curi->size) - 1);
            printf("\t}\n");
            genflags(flag_logical_noclobber, curi->size, "val", "", "");
            genastore("val", curi->dmode, "dstreg", curi->size, "data");
            break;
        case i_ROXL:
            genamode(curi->smode, "srcreg", curi->size, "cnt", 1, 0);
            genamode(curi->dmode, "dstreg", curi->size, "data", 1, 0);
            start_brace();
            switch (curi->size)
            {
                case sz_byte: printf("\tuae_u32 val = (uae_u8)data;\n"); break;
                case sz_word: printf("\tuae_u32 val = (uae_u16)data;\n"); break;
                case sz_long: printf("\tuae_u32 val = data;\n"); break;
                default: abort();
            }
            printf("\tcnt &= 63;\n");
            printf("\tXCLEAR_CZNV;\n");
            if (source_is_imm1_8(curi))
                printf("{");
            else
            {
                force_range_for_rox("cnt", curi->size);
                printf("\tif (cnt > 0) {\n");
            }
            printf("\tcnt--;\n");
            printf("\t{\n\tuae_u32 carry;\n");
            printf("\tuae_u32 loval = val >> (%d - cnt);\n", bit_size(curi->size) - 1);
            printf("\tcarry = loval & 1;\n");
            printf("\tval = (((val << 1) | XGET_XFLG) << cnt) | (loval >> 1);\n");
            printf("\tXSET_XFLG (carry);\n");
            printf("\tval &= %s;\n", bit_mask(curi->size));
            printf("\t} }\n");
            printf("\tXSET_CFLG (XGET_XFLG);\n");
            genflags(flag_logical_noclobber, curi->size, "val", "", "");
            genastore("val", curi->dmode, "dstreg", curi->size, "data");
            break;
        case i_ROXR:
            genamode(curi->smode, "srcreg", curi->size, "cnt", 1, 0);
            genamode(curi->dmode, "dstreg", curi->size, "data", 1, 0);
            start_brace();
            switch (curi->size)
            {
                case sz_byte: printf("\tuae_u32 val = (uae_u8)data;\n"); break;
                case sz_word: printf("\tuae_u32 val = (uae_u16)data;\n"); break;
                case sz_long: printf("\tuae_u32 val = data;\n"); break;
                default: abort();
            }
            printf("\tcnt &= 63;\n");
            printf("\tXCLEAR_CZNV;\n");
            if (source_is_imm1_8(curi))
                printf("{");
            else
            {
                force_range_for_rox("cnt", curi->size);
                printf("\tif (cnt > 0) {\n");
            }
            printf("\tcnt--;\n");
            printf("\t{\n\tuae_u32 carry;\n");
            printf("\tuae_u32 hival = (val << 1) | XGET_XFLG;\n");
            printf("\thival <<= (%d - cnt);\n", bit_size(curi->size) - 1);
            printf("\tval >>= cnt;\n");
            printf("\tcarry = val & 1;\n");
            printf("\tval >>= 1;\n");
            printf("\tval |= hival;\n");
            printf("\tXSET_XFLG (carry);\n");
            printf("\tval &= %s;\n", bit_mask(curi->size));
            printf("\t} }\n");
            printf("\tXSET_CFLG (XGET_XFLG);\n");
            genflags(flag_logical_noclobber, curi->size, "val", "", "");
            genastore("val", curi->dmode, "dstreg", curi->size, "data");
            break;
        case i_ASRW:
            genamode(curi->smode, "srcreg", curi->size, "data", 1, 0);
            start_brace();
            switch (curi->size)
            {
                case sz_byte: printf("\tuae_u32 val = (uae_u8)data;\n"); break;
                case sz_word: printf("\tuae_u32 val = (uae_u16)data;\n"); break;
                case sz_long: printf("\tuae_u32 val = data;\n"); break;
                default: abort();
            }
            printf("\tuae_u32 sign = %s & val;\n", cmask(curi->size));
            printf("\tuae_u32 cflg = val & 1;\n");
            printf("\tval = (val >> 1) | sign;\n");
            genflags(flag_logical, curi->size, "val", "", "");
            printf("\tXSET_CFLG (cflg);\n");
            duplicate_carry();
            genastore("val", curi->smode, "srcreg", curi->size, "data");
            break;
        case i_ASLW:
            genamode(curi->smode, "srcreg", curi->size, "data", 1, 0);
            start_brace();
            switch (curi->size)
            {
                case sz_byte: printf("\tuae_u32 val = (uae_u8)data;\n"); break;
                case sz_word: printf("\tuae_u32 val = (uae_u16)data;\n"); break;
                case sz_long: printf("\tuae_u32 val = data;\n"); break;
                default: abort();
            }
            printf("\tuae_u32 sign = %s & val;\n", cmask(curi->size));
            printf("\tuae_u32 sign2;\n");
            printf("\tval <<= 1;\n");
            genflags(flag_logical, curi->size, "val", "", "");
            printf("\tsign2 = %s & val;\n", cmask(curi->size));
            printf("\tXSET_CFLG (sign != 0);\n");
            duplicate_carry();

            printf("\tXSET_VFLG (XGET_VFLG | (sign2 != sign));\n");
            genastore("val", curi->smode, "srcreg", curi->size, "data");
            break;
        case i_LSRW:
            genamode(curi->smode, "srcreg", curi->size, "data", 1, 0);
            start_brace();
            switch (curi->size)
            {
                case sz_byte: printf("\tuae_u32 val = (uae_u8)data;\n"); break;
                case sz_word: printf("\tuae_u32 val = (uae_u16)data;\n"); break;
                case sz_long: printf("\tuae_u32 val = data;\n"); break;
                default: abort();
            }
            printf("\tuae_u32 carry = val & 1;\n");
            printf("\tval >>= 1;\n");
            genflags(flag_logical, curi->size, "val", "", "");
            printf("XSET_CFLG (carry);\n");
            duplicate_carry();
            genastore("val", curi->smode, "srcreg", curi->size, "data");
            break;
        case i_LSLW:
            genamode(curi->smode, "srcreg", curi->size, "data", 1, 0);
            start_brace();
            switch (curi->size)
            {
                case sz_byte: printf("\tuae_u8 val = data;\n"); break;
                case sz_word: printf("\tuae_u16 val = data;\n"); break;
                case sz_long: printf("\tuae_u32 val = data;\n"); break;
                default: abort();
            }
            printf("\tuae_u32 carry = val & %s;\n", cmask(curi->size));
            printf("\tval <<= 1;\n");
            genflags(flag_logical, curi->size, "val", "", "");
            printf("XSET_CFLG (carry >> %d);\n", bit_size(curi->size) - 1);
            duplicate_carry();
            genastore("val", curi->smode, "srcreg", curi->size, "data");
            break;
        case i_ROLW:
            genamode(curi->smode, "srcreg", curi->size, "data", 1, 0);
            start_brace();
            switch (curi->size)
            {
                case sz_byte: printf("\tuae_u8 val = data;\n"); break;
                case sz_word: printf("\tuae_u16 val = data;\n"); break;
                case sz_long: printf("\tuae_u32 val = data;\n"); break;
                default: abort();
            }
            printf("\tuae_u32 carry = val & %s;\n", cmask(curi->size));
            printf("\tval <<= 1;\n");
            printf("\tif (carry)  val |= 1;\n");
            genflags(flag_logical, curi->size, "val", "", "");
            printf("XSET_CFLG (carry >> %d);\n", bit_size(curi->size) - 1);
            genastore("val", curi->smode, "srcreg", curi->size, "data");
            break;
        case i_RORW:
            genamode(curi->smode, "srcreg", curi->size, "data", 1, 0);
            start_brace();
            switch (curi->size)
            {
                case sz_byte: printf("\tuae_u8 val = data;\n"); break;
                case sz_word: printf("\tuae_u16 val = data;\n"); break;
                case sz_long: printf("\tuae_u32 val = data;\n"); break;
                default: abort();
            }
            printf("\tuae_u32 carry = val & 1;\n");
            printf("\tval >>= 1;\n");
            printf("\tif (carry) val |= %s;\n", cmask(curi->size));
            genflags(flag_logical, curi->size, "val", "", "");
            printf("XSET_CFLG (carry);\n");
            genastore("val", curi->smode, "srcreg", curi->size, "data");
            break;
        case i_ROXLW:
            genamode(curi->smode, "srcreg", curi->size, "data", 1, 0);
            start_brace();
            switch (curi->size)
            {
                case sz_byte: printf("\tuae_u8 val = data;\n"); break;
                case sz_word: printf("\tuae_u16 val = data;\n"); break;
                case sz_long: printf("\tuae_u32 val = data;\n"); break;
                default: abort();
            }
            printf("\tuae_u32 carry = val & %s;\n", cmask(curi->size));
            printf("\tval <<= 1;\n");
            printf("\tif (XGET_XFLG) val |= 1;\n");
            genflags(flag_logical, curi->size, "val", "", "");
            printf("XSET_CFLG (carry >> %d);\n", bit_size(curi->size) - 1);
            duplicate_carry();
            genastore("val", curi->smode, "srcreg", curi->size, "data");
            break;
        case i_ROXRW:
            genamode(curi->smode, "srcreg", curi->size, "data", 1, 0);
            start_brace();
            switch (curi->size)
            {
                case sz_byte: printf("\tuae_u8 val = data;\n"); break;
                case sz_word: printf("\tuae_u16 val = data;\n"); break;
                case sz_long: printf("\tuae_u32 val = data;\n"); break;
                default: abort();
            }
            printf("\tuae_u32 carry = val & 1;\n");
            printf("\tval >>= 1;\n");
            printf("\tif (XGET_XFLG) val |= %s;\n", cmask(curi->size));
            genflags(flag_logical, curi->size, "val", "", "");
            printf("XSET_CFLG (carry);\n");
            duplicate_carry();
            genastore("val", curi->smode, "srcreg", curi->size, "data");
            break;
        default:
            m68k_pc_offset = 0;
            break;
    }
    finish_braces();
    sync_m68k_pc();
}

static int postfix;

static void generate_one_opcode(int rp)
{
    int i;
    uae_u16 smsk, dmsk;
    long int opcode = opcode_map[rp];

    if (table68k[opcode].mnemo == i_ILLG
        || table68k[opcode].clev > cpu_level)
        return;

    for (i = 0; lookuptab[i].name[0]; i++)
    {
        if (table68k[opcode].mnemo == lookuptab[i].mnemo)
            break;
    }

    if (table68k[opcode].handler != -1)
        return;

    if (opcode_next_clev[rp] != cpu_level)
    {
        fprintf(stblfile, "{ xop_%lx_%d, %ld }, /* %s */\n", opcode, opcode_last_postfix[rp],
                opcode, lookuptab[i].name);
        return;
    }
    fprintf(stblfile, "{ xop_%lx_%d, %ld }, /* %s */\n", opcode, postfix, opcode, lookuptab[i].name);
    fprintf(headerfile, "extern xcpuop_func xop_%lx_%d;\n", opcode, postfix);
    printf("void xop_%lx_%d(uae_u32 opcode) /* %s */\n{\n", opcode, postfix, lookuptab[i].name);

    switch (table68k[opcode].stype)
    {
        case 0: smsk = 7; break;
        case 1: smsk = 255; break;
        case 2: smsk = 15; break;
        case 3: smsk = 7; break;
        case 4: smsk = 7; break;
        case 5: smsk = 63; break;
        case 7: smsk = 3; break;
        default: abort();
    }
    dmsk = 7;

    next_cpu_level = -1;
    if (table68k[opcode].suse
        && table68k[opcode].smode != imm && table68k[opcode].smode != imm0
        && table68k[opcode].smode != imm1 && table68k[opcode].smode != imm2
        && table68k[opcode].smode != absw && table68k[opcode].smode != absl
        && table68k[opcode].smode != PC8r && table68k[opcode].smode != PC16)
    {
        if (table68k[opcode].spos == -1)
        {
            if (((int)table68k[opcode].sreg) >= 128)
                printf("\tuae_u32 srcreg = (uae_s32)(uae_s8)%d;\n", (int)table68k[opcode].sreg);
            else
                printf("\tuae_u32 srcreg = %d;\n", (int)table68k[opcode].sreg);
        }
        else
        {
            char source[100];
            int pos = table68k[opcode].spos;

            if (pos)
                sprintf(source, "((opcode >> %d) & %d)", pos, smsk);
            else
                sprintf(source, "(opcode & %d)", smsk);

            if (table68k[opcode].stype == 3)
                printf("\tuae_u32 srcreg = ximm8_table[%s];\n", source);
            else if (table68k[opcode].stype == 1)
                printf("\tuae_u32 srcreg = (uae_s32)(uae_s8)%s;\n", source);
            else
                printf("\tuae_u32 srcreg = %s;\n", source);
        }
    }
    if (table68k[opcode].duse
        /* Yes, the dmode can be imm, in case of LINK or DBcc */
        && table68k[opcode].dmode != imm && table68k[opcode].dmode != imm0
        && table68k[opcode].dmode != imm1 && table68k[opcode].dmode != imm2
        && table68k[opcode].dmode != absw && table68k[opcode].dmode != absl)
    {
        if (table68k[opcode].dpos == -1)
        {
            if (((int)table68k[opcode].dreg) >= 128)
                printf("\tuae_u32 dstreg = (uae_s32)(uae_s8)%d;\n", (int)table68k[opcode].dreg);
            else
                printf("\tuae_u32 dstreg = %d;\n", (int)table68k[opcode].dreg);
        }
        else
        {
            int pos = table68k[opcode].dpos;
            #if 0
            /* Check that we can do the little endian optimization safely.  */
            if (pos < 8 && (dmsk >> (8 - pos)) != 0)
                abort();
            #endif
            if (pos)
                printf("\tuae_u32 dstreg = (opcode >> %d) & %d;\n",
                       pos, dmsk);
            else
                printf("\tuae_u32 dstreg = opcode & %d;\n", dmsk);
        }
    }
    need_endlabel = 0;
    endlabelno++;
    sprintf(endlabelstr, "endlabel%d", endlabelno);
    gen_opcode(opcode);
    if (need_endlabel)
        printf("%s: ;\n", endlabelstr);
    printf("}\n");
    opcode_next_clev[rp] = next_cpu_level;
    opcode_last_postfix[rp] = postfix;
}

static void generate_func(void)
{
    int i, j, rp;

    using_prefetch = 0;
    using_exception_3 = 0;
    for (i = 0; i <= 0; i++)
    {
        cpu_level = 5;

        postfix = i;
        fprintf(stblfile, "struct xcputbl xop_smalltbl_%d[] = {\n", postfix);

        rp = 0;
        for (j = 1; j <= 8; ++j)
        {
            int k = (j * nr_cpuop_funcs) / 8;
            for (; rp < k; rp++)
                generate_one_opcode(rp);
        }

        fprintf(stblfile, "{ 0, 0 }};\n");
    }

}

static void generate_includes(FILE* f)
{
    fprintf(f, "#include \"cpu_small.h\"\n");
    fprintf(f, "#include \"cputbl_small.h\"\n");
}

int main(int argc, char** argv)
{
    read_table68k();
    do_merges();

    opcode_map = (int*)xmalloc(sizeof(int) * nr_cpuop_funcs);
    opcode_last_postfix = (int*)xmalloc(sizeof(int) * nr_cpuop_funcs);
    opcode_next_clev = (int*)xmalloc(sizeof(int) * nr_cpuop_funcs);
    counts = (unsigned long*)xmalloc(65536 * sizeof(unsigned long));
    read_counts();

    /* It would be a lot nicer to put all in one file (we'd also get rid of
     * cputbl.h that way), but cpuopti can't cope.  That could be fixed, but
     * I don't dare to touch the 68k version.  */

    headerfile = fopen("cputbl_small.h", "wb");
    stblfile = fopen("cpustbl_small.c", "wb");
    generate_includes(stblfile);
    freopen("cpuemu_small.c", "wb", stdout);
    generate_includes(stdout);

    generate_func();

    free(table68k);
    return 0;
}